The United States gave military training to more than 5,700 Mexican
police and soldiers in some 45 U.S. locations and at least ten sites in
Mexico during the last two years, according to datapublished by the State Department.

The training ranged from jungle riverine exercises at the Stennis
Space Center in Mississippi and desert operations at Fort Bliss in El
Paso, to helicopter pilot training at Fort Rucker, Alabama and maritime
policing in the US Coast Guard’s training center in Yorktown, Virginia.
Some U.S. training sites train very few foreign students, often just one
or two per country.

Most U.S. military training for Mexican armed forces occurred in
Mexico, not the United States. More than half occurred in three
locations: Campeche on the Yucatan Peninsula, Mexico City, and the
southern border city of Tapachula.

U.S.
Marines gave pre-deployment training to most of more than 900 Mexican
Marines in Tapachula in 2014. Marines have been training Mexican
soldiers in both Mexico and U.S. sites since October 2012, according to Marine Corp Times. U.S. Border Patrol trainers also instructed 30 Mexican naval forces on doing vehicle stops at a course in Tapachula.

At San Miguel de Jagueyos, 55 miles north of Mexico City, US Army
North instructors trained more than 300 Mexican soldiers in rifle
marksmanship, urban operations, and combat casualty care in the Spring
and Summer of 2014. US Army North reports it is creating a long-term strategy for U.S.-Mexico military
activities, which it calls Theater Security Cooperation. The military
training base in San Miguel Jagueyos was the site of executions by the
Army in 1988, according to testimony by a deserter who requested asylum in Canada.

The map below shows mostly but not entirely military training.
Congress requires U.S. agencies to report annually on military training
of foreign forces, but there has been no legal requirement to report on
foreign police training. But in Mexico as in Central America, police and
other law enforcement agencies have been primarily responsible for
operations against drugs and immigration that are Washington’s highest
priority.

The Mexican presidency recently reported that the United States supported the training of 19,473 agents of
Mexico’s immigration enforcement agency (National Migration Institute,
or INM) in interrogation of terrorism suspects, relations with the
public, interview techniques, and other subjects. But since the INM has
only 5,400 agents, the number likely includes members of other Mexican
police forces as well as multiple courses for some agents. Federal
Police agents frequently work together with INM.

Not included in this data and map is training of Mexican forces
conducted by Colombian trainers, even when this was financed by the
United States. According to the Colombian government, the country's
national police trained 10,310 Mexican police between 2009 and 2013.
Mexico has been the largest recipient of Colombian military and police
training, but this is largely an agreement between Colombia and Mexico.